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From: Maurice & Louise-Ann on AKAMA (no email)
Date: Thu Nov 03 2005 - 14:23:58 EST
Hmmm...
I've been thinking some more about this vented loop thing...very
interesting thread. Most of the trawlers we have crawled through do not
have them on all bilge discharges, and I've wondered why. Then it hit
me; in the pursuit of space, trawler manufacturers place the
accommodation deck as low as possible and have multiple levels of them.
Some of our boats look like wedding cakes, they are piled so high.
Because much of the main accommodation deck is above the engine room, at
or just above the waterline, there is no room for much of a vented loop
below decks. But, because it is above the waterline even if we heel
over a bit (barely above in some cases), they can get away without one.
But, "just in case", they put in check valves. So perhaps the trawler
manufacturers give us the bare minimum in terms of safety
I've also crawled through a ton of sailboats, whose main deck is
generally all below the waterline, and the manufacturers generally run
the loop well up above the waterline behind a cupboard or some other
accessible place. Why the difference? Well, since sailboats heel over
and their accommodation decks are so low (below the waterline) they have
no choice.
Proposal for discussion: in the interests of safety should we not
re-plumb our bilge pump through hulls to a point much higher above the
waterline, or failing that move the vented loop up, above the deck level
if necessary? Having said that, my previous comment still stands
though--theory is grand, but when did any of us actually witness a boat
sinking due to a stuck one-way valve).
Best to all,
Maurice
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